These are typically placed near a light trap. A must have for light dep greenhouses.
Backdraft Damper, louver, shutter.
We have both 24 and 36″. Manual and electric.
Fresh air intake shutter. Shutter typically stays closed keeping your greenhouse warm. When the exhaust fan turns on, negative pressure is created therefor opening shutters and bringing in fresh air.
Fits Fan Diameter . 24 In., Shutter Overall Size 27 In. x 27 In., Shutter Construction Material G-90 Galvanized Steel Frame and Tie Rods, Shutter Opening Required 24-1/2 In. x 24-1/2 In., Blade Material Mill Finish Aluminum